University of Oulu

Abdel-Aziem, W., Hamada, A., Makino, T. et al. Microstructure Evolution of AA1070 Aluminum Alloy Processed by Micro/Meso-Scale Equal Channel Angular Pressing. Met. Mater. Int. 27, 1756–1768 (2021).

Microstructure evolution of AA1070 aluminum alloy processed by micro/meso‑scale equal channel angular pressing

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Author: Abdel-Aziem, Walaa1,2; Hamada, Atef1,3; Makino, Takehiko4;
Organizations: 1Department of Material Science and Engineering, Egypt-Japan University of Science and Technology (E-JUST), P. O. Box 179, New Borg El-Arab City, Alexandria, 21934, Egypt
2Department of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Egypt
3Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500, Nivala, Finland
4Department of Mechanical Engineering, Nagoya Institute of Technology, Nagoya, Aichi, 466-8555, Japan
5Mechanical Engineering, Faculty of Engineering, Assiut University, Assiut, 71515, Egypt
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 3.1 MB)
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Language: English
Published: Springer Nature, 2019
Publish Date: 2020-11-25


The Micro/meso-forming of commercially pure aluminum, AA1070, processed at room temperature by equal channel angular pressing (ECAP) with a die channel angle of 90° through 4 deformation passes has been conducted. Microstructure features, such as grain size, misorientation angle distributions and the developed texture during the four deformation passes of micro/meso-ECAP have been investigated by Electron backscattering diffraction (EBSD) technique. Then, hardness measurements over the cross-section of the processed samples were correlated with the EBSD analysis. EBSD scans revealed that extended shear bands are formed and represent the microstructural feature induced during micro/meso-forming. Whereas, a non-uniform grain structure consisting of intensive low-angle grain boundaries was obtained in the first pass, a uniform ultrafine-grained structure of high-angle grain boundaries (in the range of 1–2 μm) was achieved at the fourth pass. Consequently, a significant improvement in the hardness value to 65.3%, with respect to the starting material, was achieved due to the enhancement of the fine grain structure. The texture analysis exhibited that the high plastic shear strain associated with micro/meso-scale ECAP was capable to develop a weak texture in the flow plane compared to the starting texture.

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Series: Metals and materials international
ISSN: 1598-9623
ISSN-E: 2005-4149
ISSN-L: 1598-9623
Volume: 2021; 27
Issue: 6
Pages: 1756 - 1768
DOI: 10.1007/s12540-019-00544-4
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: One of the authors (W.A) is pleased to acknowledge the financial support from the Missions Sector-Higher Education Ministry, Egypt, and the Japan International Cooperation Agency (JICA) through this work.
Copyright information: © The Korean Institute of Metals and Materials 2019. This is a post-peer-review, pre-copyedit version of an article published in Metals and Materials International. The final authenticated version is available online at: